Driver's door, remote central locking fault

[Keat63]

Have you considered replacing the small internal motor.

Drivers Central Locking NC - Actuator technical info

The central locking failed on the drivers door about 5 years ago, so I fitted a used actuator. Ive just been out and its blooming failed again. It makes no sense why its the drivers side, I mean the passenger side has operated just as many times.